OSM has its fair share of inconsistencies but it's not that bad.
The map is ok for what it is: Just for presentation inside of iPhoto, not for browsing or finding your way. I really hope that Apple doesn't plan to use this anywhere else and hat they just didn't go with Google because they can't customize their maps any way they want.
(That missing credit is also shameful. I was looking everywhere inside of iPhoto but couldn't find it. Stuff like that sould at least be moderately easy to find.)